Question about 2003 GMC Yukon Denali
Posted by Anonymous on
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Posted on Jan 02, 2017
if your engine starts up and dies right away the you probably have a fuel pump problem and the service ride control mean that your air ride compressor has gone bad just turn your key to the on position and wait about 30 seconds you will here buzzing from the left rear wheel area if the compressor is working
Posted on Jul 19, 2009
In order to know what the problem is, you need to have the error code(s) read. Try any mechanic... or many auto parts stores will check the codes for free.
From there the codes can be interpreted and a course of action determined.
Posted on Oct 07, 2009
Absolutely YES! The bearing and hub assembly contains the wheel speed sensor which is used by the Antilock Brake System (ABS) and the Traction Control (TC) system to see when a wheel is trying to lock up and cause skidding. The ABS will release the hydraulic pressure to the brake on that wheel and the traction control will reduce engine speed to prevent the wheel from locking up or causing you to spin out.
Many GM vehicles also commonly have problems with the wiring harnesses to the wheel speed sensors that can cause this same problem. The computer does not know WHY it cannot read the speed sensor signal. It only knows that it is not getting the signal and this is why the light is turned on. Before paying the BIG BUCKS for a wheel bearing and hub assembly, it would be wise to make absolutely certain that the problem is not being caused by a fault in the wiring harness. I have seen many mechanics automatically replace the wheel bearing only to find out that the problem still exists because they did not take the time to DIAGNOSE the problem. The fault code description says "Wheel Speed Sensor CIRCUIT fault." They see "speed sensor and automatically replace the sensor without actually checking the circuit. Not a problem unless you are the customer having to PAY for this type of guess-work!!!
There are wiring harness repair kits available for MOST GM vehicles just for this purpose.
I have included pictures of the bearing and hub assembly and the wiring harness kit to help you understand what we are talking about here.
Note the electrical connector sticking out of the hub assembly. This is the wires to the speed sensor. In the other picture, the connector at the end of the wiring harness is what plugs into the connector in the hub assembly. The other end of it gets spliced into the main vehicle harness in the engine compartment, after cutting the original harness out.
WHEEL BEARING AND HUB ASSEMBLY
WIRING HARNESS REPAIR KIT
Posted on Aug 20, 2011
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